I'm interested in this question too, and will be running from a Mac Mini to a Pacecar to a Northstar DAC. Thanks, Peter
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I have not compared the two, however, I bought the Blue Jeans Cable version of the Mitsubishi optical plastic running 25 feet from my DirecTV HD receiver to my processor. I have never had a single drop-out or anything other than a perfect signal. As in eyeglasses, there is a difference between types of plastic. This material seems to be fine. Glass is supposedly superior but it has to be handled more carefully and is more expensive. The Blue Jean Toslink is $28 for 25 feet.
You might be interested in this old review of Toslink vs RCA digital cables ......
I tried a newer version of the WireWorld cable between my Sony 707 and Bel Canto dac2 and was very impressed. A cheaper plastic Toslink I tried later seemed to veil the music.
I had a monster plastic optical cable from my DVD Blue ray player and receiver and the Wire World Glass optical kicked butt on the plastic. It was not subtle. Spent a little over a $100 for it but don't know if the more affordable glass optical sounds similiar. Only your 2 ears can tell you if they sound better.